Round #2
Set up a 3 rose spray, with different sized stems/sprues. The yellow dot in the center is where I dripped some wax in to plug the wick hole. I used a 2:1 ratio of PoP and Silica flour, seemed to have more cracking issues. Probably from the fast burnout.
I got real brave and decided to use brass. I did a slam bam burnout again, probably 30 minutes total, until the mold was white inside and quit smoking. Then melted the brass. I didn't take into account that the furnace was already hot and the brass melted faster than I expected. It kind of got away from me. I had a firestorm in the top of the crucible, swirling, molten bright yellow with occational flashed of white light. That was the zinc burning out. I took it out of the furnace and let it set a little to settle down. Then poured. The one with the 3/8" sprue was the only one to fill, the other 2 partially filled and froze off. Oh well, bigger sprues and maybe some vents.
